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Published on Sep 4, 2012
Volcanoes and types of volcanic eruptions | Volcano video with hot magma lava in 3D animation HD
It is a known fact evidenced by the mine workers that temperature and pressure increases with depth. Inside the earth crust scientists have estimated that temperature would be around 6000 degree Celsius at the core or the center of our planet. The outer layers of the earth consist of layers of rock contain of different types of minerals. There are few of minerals called radio activity mineral such as radium, uranium, thorium, plutonium etc. which continuously emanate heat when they are present in the deep seated rocks the heat thus emitted gets accumulated as the rocks which are bad conductors of heat. This accumulated heat melts the rock around forming a reservoir of molten rock material called magma which upon reaching the earth surface is called lava. While the solid rocks are liquefied water vapor and many other gas are released which as there no way to escape Also occupy same chamber along with the magma and exert great pressure up on it. Hence magma try escape regions where the pressure is comparatively less and thus in that process reaches the surface of the earth through fissures and joints present in the upper layers of the earth crust. As the excessive heat and pressure is released it solidifies again forming lgneous rocks. Some magma is solidified along the passage to the earth`s surface. This process is called vulcanicity. A volcano is an opening on the earth`s surface through which rock fragments, lava, cinder, ash, smoke, steam and other gases such as sulphur dioxide, ammonium chloride, hydrogen sulphide and carbon dioxide are emitted during an eruption. There are two types of volcanic eruption. The central type and the fissure type. The central type of eruption: this type of eruption usually involves a single vent the solid and molten rock materials ejected accumulate around. The vent forming a hill or a mountain is more or less conical in shape at the apex of these volcanic cones are funnel shaped depressions called craters which usually contain crater lakes but facile discharge volcanic material at the time of an eruption. The fissure type of eruption This type of eruption involves a series of winds present along a fault line in the earths crust discharging enormous quantity of lava leading to the formation of lava planes and plateaus usually hundreds of square kilometers' in area.